That way they are well rested for the final race day and their bags have been long stowed in a hotel long before the Final 3 ever arrive in Las Vegas. If they need some bags for appearance sake, they bring those along.

We see Brian put a stack on the table, perhaps they are labeled with where they have been type clues or tasks they have done, like maybe say for instance a monkey chip? And perhaps they have to collect x amount of one color with the logo then stack it in a certain order on the table?